Zachaeiah adam hall



Z.A.HALL.

STOVE OR RANGE.

- APPUCATION FILEQ DEC. 29| 1919.

L376 Patented May 3, 1921.-

auweufor.

PATENT OFFICE.

ZACHARIAIH ADAM HALL, OF HESPELER, ONTARIO, CANADA.

STOVE OR RANGE.

Application filed December 29, 1919.

To all whom it may concern:

' Be it known that I, ZACHARIAH ADAM HALL, of the town of Hespeler, in the county of Waterloo and Province of Ontario, Dominion of Canada, have invented certain new and useful Improvements in Stoves or Ranges; and I hereby declare the following is a full, clear, and exact description of the same.

This invention relates to a stove or range in which provision is made for intimately mixing together the gases resulting from the combustion of the fuel in the fire box or fire chamber, and it further relates to the provision for combining a secondary supply of atmospheric air with these gases during the combustion period and for preheating this secondary air supply before it reaches the position where it mixes with the gases, the object of the invention being to effect complete combustion of the fuel and to utilize all of the thermal units thereof.

For an understanding of one means by which this object may be attained reference is to be had to the following description and to the accompanying drawing which represents a vertical section of a cook stove or range embodying the principles of the invention.

a represents, as a whole, the shell of the stove; 6 represents the oven therein; and 0 represents the fire box between the oven and the stove front a. Between the oven and the stove top a is a flue d and at the back and bottom of the oven are flues e and 7 respectively.

As shown in the drawing the flue (l is of relatively considerable depth, and forms, what may be termed, a secondary combustion chamber for the gases passing from the fire box 0 to the smoke outlet 5/, this smoke outlet being preferably located below the fire box and the only one through which the products of combustion are discharged.

Between the fire box 0 and the oven front I) is an air flue in extending vertically from the bottom of the fire box to a distributing flue 71/ arranged transversely across the oven top 6 at or near the front thereof.

The distributing flue it has a series of distributing ports it" preferably formed in the vertical side h opposed to the secondary combustion chamber for the atmospheric air passing through the air flue it into the distributing flue it, to flow directly into the Specification of Letters Patent.

- with the Patented May 3, 1921.

Serial No. 348,158.

secondary combustion chamber and mix gases therein. The fire box 0, as shown 1n the drawlng, extends to or slightly above the top of the distributing flue h and acts as a bridge wall or baflle to direct the products of combustion from the fire box into the upper part of the secondary combustion chamber and prevent the force of the current exerting itself on the gases in the secondary combustion chamber below the level of the top of the fire box or distributing flue. Depending from the stove top a above the distributing flue h is a baffle z, the depth of which is such as to form, with the distributing flue h, a relatively narrow passage 2" through which the products of combustion from the fire box 0 may pass into the secondary combustion chamber.

These products of combustion which pass upwardly in the fire box 0 to the stove top a and impinge on the batfle i are deflected downwardly by it toward the restricted passage z" and there meet the products of combustion which are flowing over the top of the fire box and the distributing flue h. This creates, what may be termed, a vortex and causes the thorough commingling of the constituents of the gases, as they enter the secondary combustion chamber at, and enables the uncombined carbon of the gases to combine with some of the oxygen of the carbon dioxid (CO and thus reconvert the gases or part of them into carbon monoxid (CO), thereby rendering them combustible to the extent of the carbon monoxid content of the gases entering the secondary combustion chamber.

The dimensions of the secondary combustion chamber 03 are such as to permit of the rapid expansion of the gases when they enter therein so that the carbon dioxid and carbon of the gases can be quickly converted into carbon monoxid for the secondary combustion which, by actual tests, shows that not only complete combustion but also an increase of approximately fifteen per cent. in the heating value of the fuel, can be effected. I

Below the fire box 0 is an air inlet for the ingress of atmospheric air to the fire box and to the air flue h, the air flue it being provided with a damper 70, which regulates the flow of the atmospheric air through the distributing flue h termed for convenience the secondary air supply. Under certain conditions of use and for certain classes of fuel this secondary air supply may be necessary, and in such cases the damper 7c is adjusted for the flow of the requisite quantity of secondary air to the combustion flue d, the air, while in the flues h, h, becoming heated by convection. Under certain conditions of use the secondary air supply may not be necessary and the air flues h, it, may then be dispensed with. In such cases the fire box will project above the lower part of the secondary combustion chamber and form a bridge wall to protect the gases in the lower part of the secondary combustion chamber from the force of the gases enterin it.

rom the secondary combustion chamber d the completely consumed gases pass clownwardly through the flue e at the back of the oven to the flue f below it and egress by means of the smoke outlet As various changes ormodiflcations may be made in what is shown and described, it is not intended that the invention should be confined to these particular structural de tails.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent is:

1. A stove or range comprising a shell having an oven therein, a secondary combustion chamber between the oven top and shell, means for feeding air thereto, a flue between the oven back and shell, and a flue between the oven bottom and shell having a smoke outlet, this being the only egress for the products of combustion, in combination with a fire box between the oven front and shell, and a bridge wall between'the fire box and the secondary combustion chamber.

2. A stove or range comprising a shell having an oven therein, asecondary combustion chamber between the oven top and shell,'means for feeding air thereto, a flue between the oven back and shell, and a flue between the oven bottom and shell having a smoke outlet, this being the only egress for the products of combustion, in combination with a fire box between the oven front and shell, and a bridge wall between the fire box and the secondary combustion chamber, and a bafiie depending from the stove top above the bridge wall and forming therewith a restricted passage from the fire box to the secondary combustion chamber;

3. A stove or range comprising a. shell having an oven therein, a secondary combustion chamber between the oven top and shell, a flue between the oven back and shell, and a flue between the oven bottom and shell having a smoke outlet, this being the only egress for the products of combustion, in combination with a fire box between the oven front and shell, an air flue between the fire box and oven, and a distributing flue above the oven top forming a bridge wall between the fire box and secondary combustion chamber, and connected with the air flue and discharging into the secondary combustion chamber.

Toronto, November 26th, 1919.

ZACHARIAH A. HALL.

Signed in the presence of- Cass. H. RIoHns, W. J. GILCHRIST. 

